docs: Fix typo in Custom Matchers API (#10670)

Author: msmolens

docs/ExpectAPI.md

@@ -110,7 +110,7 @@ test('is divisible by external value', async () => {
 
 #### Custom Matchers API
 
-Matchers should return an object (or a Promise of an object) with two keys. `pass` indicates whether there was a match or not, and `message` provides a function with no arguments that return an error message in case of failure. Thus, when `pass` is false, `message` should return the error message for when `expect(x).yourMatcher()` fails. And when `pass` is true, `message` should return the error message for when `expect(x).not.yourMatcher()` fails.
+Matchers should return an object (or a Promise of an object) with two keys. `pass` indicates whether there was a match or not, and `message` provides a function with no arguments that returns an error message in case of failure. Thus, when `pass` is false, `message` should return the error message for when `expect(x).yourMatcher()` fails. And when `pass` is true, `message` should return the error message for when `expect(x).not.yourMatcher()` fails.
 
 Matchers are called with the argument passed to `expect(x)` followed by the arguments passed to `.yourMatcher(y, z)`:
 

website/versioned_docs/version-26.2/ExpectAPI.md

@@ -111,7 +111,7 @@ test('is divisible by external value', async () => {
 
 #### Custom Matchers API
 
-Matchers should return an object (or a Promise of an object) with two keys. `pass` indicates whether there was a match or not, and `message` provides a function with no arguments that return an error message in case of failure. Thus, when `pass` is false, `message` should return the error message for when `expect(x).yourMatcher()` fails. And when `pass` is true, `message` should return the error message for when `expect(x).not.yourMatcher()` fails.
+Matchers should return an object (or a Promise of an object) with two keys. `pass` indicates whether there was a match or not, and `message` provides a function with no arguments that returns an error message in case of failure. Thus, when `pass` is false, `message` should return the error message for when `expect(x).yourMatcher()` fails. And when `pass` is true, `message` should return the error message for when `expect(x).not.yourMatcher()` fails.
 
 Matchers are called with the argument passed to `expect(x)` followed by the arguments passed to `.yourMatcher(y, z)`: